Anti-galling pump rotor for an internal gear pump

Details Anti-galling pump rotor for an internal gear pump Anti-galling pump rotor for an internal gear pump

2005-11-14

2009-12-15

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Specific material

C418S171000, C418S178000

Reexamination Certificate

active

07632083

ABSTRACT:
In pump rotors and used in an internal gear pump, which includes an inner pump rotor having outer gear teeth; an outer pump rotor having inner gear teeth that mesh with the outer gear teeth ; and a casing having a pumping-in port through which a fluid is pumped in, and a pumping-out port through which the fluid is pumped out, and pumps in and pumps out the fluid by changing the cell volume formed between gear tooth surfaces of the rotors and so as to carry the fluid when the rotors and mesh with each other and rotate, the rotors are formed from a sintered material of Fe—Cu—C and have a density of not less than 6.6 g/cm3and not more than 7.1 g/cm3, and the outer circumferential surface of the outer pump rotor and the end surfaces perpendicular to rotation axes of the rotors and are non-grinded surface and have a ten point height of irregularities Rz of not less than 4 μm and not more than 10 μm.

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